Fix Docusaurus blog posts missing truncation markers

[Copilot]

Resolves Docusaurus build warnings about blog posts without truncation markers by adding {/* truncate */} markers to all 36 affected blog posts.

Problem

Docusaurus was generating warnings during build:

[WARNING] Docusaurus found blog posts without truncation markers:
- "blog/2025-09-25-heroku-migration.md"
- "blog/2025-09-15-agentic-era.md"
- "blog/2025-09-09-august-product-updates.md"
...

This affected blog post previews on paginated blog lists, where the entire content was being displayed instead of a truncated preview.

Solution

Added {/* truncate */} markers to all 36 blog posts that were missing them. The markers were strategically placed after the introductory content (typically 1-2 paragraphs) to provide meaningful previews while keeping them concise.

Technical Details

Since the Docusaurus configuration sets format: 'mdx', all markdown files (both .md and .mdx) are processed as MDX format, requiring JSX comment syntax {/* truncate */} instead of HTML comment syntax <!-- truncate -->.

Testing

• ✅ Build completes successfully with no truncation warnings
• ✅ All blog posts now display proper truncated previews on blog index pages
• ✅ No existing functionality affected

This change improves the user experience on blog paginated lists by showing concise previews instead of full article content.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Docusaurus found blog posts without truncation markers</issue_title>
<issue_description>
[WARNING] Docusaurus found blog posts without truncation markers:

• "blog/2025-09-25-heroku-migration.md"
• "blog/2025-09-15-agentic-era.md"
• "blog/2025-09-09-august-product-updates.md"
• "blog/2025-08-22-agentic-apps.md"
• "blog/2025-08-12-july-product-updates.md"
• "blog/2025-08-07-defang-ai-devops-agent.md"
• "blog/2025-07-14-defang-gcp-compose.md"
• "blog/2025-07-10-june-product-updates.md"
• "blog/2025-06-16-crew-ai-sample.md"
• "blog/2025-06-16-docker-compose-defang.md"
• "blog/2025-06-06-may-product-updates.md"
• "blog/2025-05-09-april-product-updates.md"
• "blog/2025-04-23-vibe-deploy.md"
• "blog/2025-04-11-mar-product-updates.md"
• "blog/2025-04-10-easiest-way-to-deploy-django.md"
• "blog/2025-03-26-deploying-defang-with-defang-part-2.md"
• "blog/2025-03-15-feb-product-updates.md"
• "blog/2025-03-14-deploying-defang-with-defang-part-1.md"
• "blog/2025-03-12-website-logo-refresh-announcement.md"
• "blog/2025-02-18-model-context-protocol.md"
• "blog/2025-02-07-january-product-updates.md"
• "blog/2024-12-11-product-hunt.md"
• "blog/2024-12-04-launch-week.md"
• "blog/2024-11-13-october-product-updates.md"
• "blog/2024-11-12-hard-lessons-from-hardware.md"
• "blog/2024-09-30-september-product-updates.md"
• "blog/2024-08-30-august-product-updates.md"
• "blog/2024-07-31-july-product-updates-2.md"
• "blog/2024-07-01-july-product-updates.md"
• "blog/2024-06-01-june-product-updates.md"
• "blog/2024-05-01-may-product-updates.md"
• "blog/2024-03-28-slackbot-sample.md"
• "blog/2024-03-20-dev-environments.mdx"
• "blog/2024-03-04-about-my-journey-deploying-my-first-web-application.mdx"
• "blog/2024-02-12-announcing-defang-public-beta.md"
• "blog/2023-06-29-Announcing-the-Private-Beta-for-the-DOP.md"

We recommend using truncation markers (<!-- truncate --> or {/* truncate */}) in blog posts to create shorter previews on blog paginated lists.
Tip: turn this security off with the onUntruncatedBlogPosts: 'ignore' blog plugin option.</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #298

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